Senator Ben Murray-Bruce on Friday shared the picture of a woman he calls “deputy mum”.
The former Bayelsa lawmaker posted a photo of Mrs Graham on Twitter after she voted in the United States.
He said: “Mrs Graham, mother of Justice Amina Adamu Augie voting in the US elections. She is my deputy mom.”
Early voting has kicked off in the US as President Donald Trump seeks re-election despite competition from Democratic nominee Joe Biden.
More than 50 per cent of total votes recorded in 2016 have already been cast with Election Day scheduled for November 3.